dfa8e1a8

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Deduplicate the test-forest flatteners

`flattenTestForestWithIds` and `flattenTestForestWithIdsAndCallStacks` were
near-identical, differing only in what each leaf emits. Implement both in
terms of a single internal `flattenTestForestWith` that takes a leaf
projection `CallStack -> result -> a`, so the TestId-assignment logic has one
source of truth.

Dependencies Timing

Agent Instructions

Each run corresponds to one flake attribute. Click a run for its logs and status.

Example: https://staging.nix-ci.com/gh:NorfairKing:sydtest/mutation-diff-mode/dfa8e1a815471ac34913c68f85496d555f707e63/cede9b5d-67ac-4e65-a4ca-c0a23d36055f

Wait for suite to complete:

curl --netrc -N https://staging.nix-ci.com/gh:NorfairKing:sydtest/mutation-diff-mode/dfa8e1a815471ac34913c68f85496d555f707e63/wait

For more instructions, fetch https://staging.nix-ci.com/instructions .